Relief valve



May 7, 1940.

H. J. SANDS RELIEF vjmvs Filed June 19, 1937 l in HlLLARD J. SANDS NV E N T0 R ATTORNEYS.

Patented May 7, 1940 x UNITED STATES PATENT OFFICE RELIEF VALVE Hillard J. Sands, Cleveland, Ohio, assignor to Garry Sands, Cleveland, Ohio Application June 19, 1937, Serial No. 149,242

2 Claims. (Cl. 277-45) This invention relates to relief valves for boilreception of packing material 20, and provided ers, and has for an object the provision of a. valve with an upstanding hollow boss 2|. 7 A coiled of this character which will open when the presspring 22 bears upon the valve member l9, and sure in the boiler exceeds a predetermined at its opposite end bears upon an adjustable plug r, amount, which also will open when the tempera- 23 threaded into the upper end of the casing l0,

' ture in the boiler exceeds a predetermined the degree of pressure of the spring 22 on the amount, and which will open to relieve lack of valve member l9 being dependent upon the dispressure or vacuum in the boiler, the three types tance the plug 23 is threaded into the casing Ill. of mechanism being combined in a highly com- Reciprocably mounted in the boss 2| of the m pact and eflicient manner. valve member I9 is an elongated sleeve member 10 In the drawing accompanying this speciflca- 24, having a collar 25 aflixed toits upper end, tion and forming a part of this application, I and held in place by a cotter pin 26, a relatively have shown, for purposes of illustration, one emfine coiled expansion spring 21 being interposed bodiment which my'invention may assume, and between the collar 25 and the adjacent surface is in the drawing: of the valve boss 2|, the spring 21 serving nor- Figure 1 is a fragmentary sectional view, taken mally to hold the sleeve in an elevated position. thrwgh the upper end of a boil r, showing the At a predetermined distance from the upper end usual pipe connections, and a safety valve con- 01 the sleeve 24, a plurality of laterally opening nected tothe boiler and constructed in accordapertures 28 are provided-and immediately beance with the present invention, low the apertures 28, the'sleeve is enlarged and 20 Figure 2 is an enlarged, fragmentary vertical tapered to form a stop and sealing member 29, sectional view of the valve mechanism proper, adapted to cooperate with a recess 30 formed in while the packing material 20. Below the stop 29 the Figure 3 is a horizontal sectional view corresleeve is preferably somewhat enlarged, and the spending substantially to the line 3-3 of Figlower end of the sleeve 24 is closed by a thimble ure 2. 3| threaded into the end of the sleeve, which As illustrated in the drawing the invention is carries a center plug 32 of fusible material.

shown as applied to an ordinary steam or storage In use the coiled spring 22 normally holds the boiler 5, provided with the usual inlet pipe 6, and valve member iii to its seat [1, the pressure by *0 take-off pipe I. A safety outlet or discharge the spring 22 on the valve I9.being regulated by pipe 8 is provided at the upper end of the boilthreading the plug 23 a predetermined distance er, being connected thereto by means of the into the casing It. When excess pressure condisafety valve mechanism indicated as an entirety tions exist within the boiler 5 suflicient to overat 8. come the pressure exerted by the spring 22, the

The valve mechanism 9-comprises a casing I0, valve I! will be unseated so as to relieve such 35 the intermediate exterior portion of which is pressure. Should an excessive temperature exist preferably polygonal in cross-section, as shown within the boiler, the fusible plug 32 will be in Figure 3, and is provided at one-end with an melted, opening up passage through the sleeve eurteriorly threaded nipple ll adapted to be 24, and through the outlet nipple l8 and disscrewed into the top wall of the boiler 5, the opcharge pipe 8. Normally the sleeve 24 is held 40 posite end of the casing being exteriorly threadby the spring 21 in such position that the stop ed, as at l2, for the threaded reception of an 29 engages the recess 30, and the apertures 28 enclosing cap l3. Interiorly the casing I0 is cirare cut off from communication with the interior cularly chambered as at H, and this chamber of the boiler. Should a vacuous condition exist 4 communicates with a circular bore l5 extending within the boiler, the suction thus created, couthrough the nipple ll, an annular shoulder I6 pled with atmospheric pressure within the chamseparating the chamber l4 and the bore 15, and her I4, will overcome the spring 21 and cause the the shoulder it formed with a valve seat ll. Exstop 29 to leave the recess 30 and to place the tending laterally from the casing I0, is an outlet apertures 28, and the chamber l4, in communinipple l8, threaded for the reception of one end cation with the interior of the boiler, thereby al- 50 of the drainage pipe 8, the nipple l8 providing lowing air to enter and relieve the vacuous concommunication of the drainage pipe 8 with the dition and thus prevent collapse of the boiler, chamber l4. From the foregoing it will be apparent to those Cooperating with the valve seat i1 is a valve skilled in the art that the illustrated embodiment member ll, cup-shaped-at its lower end for the of my invention provides a new and improved 55 safety valve for boilers, wherein a plurality of functions are performed by the valve mechanism, yet the construction includes a minimum number of parts, is very compact, and highly efficient, and accordingly, accomplishes at least the principal objects of my invention. It further will be obvious to those skilled-in the art that the illustrated embodiment of my invention may be variously changed and modified without departing from the spirit of my invention, or sacrificing all of the advantages thereof, and that accordingly, the disclosure herein is illustrative only, and my invention is not limited thereto.

I claim: 4

1. A relief valve mechanism of the pressure, vacuum and temperature type comprising a housing including a pair of chambers adapted to be positioned in vertical alinement with a boiler with the lower chamber connected'therewith,

spring urged reversely operating pressure and vacuum relief valves normally separating said chambers, the vacuum valve including a hollow sleeve having a portion slidable through the pressure valve and snugly engaging the same, the

having a plurality of apertures normally held out of communication with the lower chamber by spring pressure and communicating therewith for vacuum relief through said sleeve whereby the hollow sleeve furnishes a single means of communication between the chambers for vacuum and temperature relief.

2. A relief valve mechanism of the pressure. vacuum and temperature type comprising a housing including apair of chambers adapted to be positioned in vertical alinement with a boiler with the lower chamber connected therewith. spring urged reversely operating pressure and vacuum relief valves normally separating said chambers, the vacuum valve including a hollow sleeve having a portion slidable through the pressure valve and snugly engaging the same, the upper end of said sleeve being positioned in the upper chamber in constant communication therewith while the lower end extends through the lower chamber, a fusible plug closing the lower end of said sleeve against normal communication with theupper chamber, the portion of said sleeve that is slidable through the pressure valve having a plurality of apertures, and stop means on the sleeve engageable with the lower portion of the pressure valve to hold and seal the apertured portion of the sleeve normally out of communication with the lower chamber.

HILLARD J. SANDS. 

